package com.maozai.maozaimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.maozai.common.exception.NoStockException;
import com.maozai.common.to.mq.OrderTo;
import com.maozai.common.to.mq.StockDetailTo;
import com.maozai.common.to.mq.StockLockedTo;
import com.maozai.common.utils.R;
import com.maozai.maozaimall.ware.entity.WareOrderTaskDetailEntity;
import com.maozai.maozaimall.ware.entity.WareOrderTaskEntity;
import com.maozai.maozaimall.ware.feign.OrderFeignService;
import com.maozai.maozaimall.ware.feign.ProductFeignService;
import com.maozai.maozaimall.ware.service.WareOrderTaskDetailService;
import com.maozai.maozaimall.ware.service.WareOrderTaskService;
import com.maozai.maozaimall.ware.vo.*;
import com.mysql.cj.util.StringUtils;
import lombok.Data;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.maozai.common.utils.PageUtils;
import com.maozai.common.utils.Query;

import com.maozai.maozaimall.ware.dao.WareSkuDao;
import com.maozai.maozaimall.ware.entity.WareSkuEntity;
import com.maozai.maozaimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;

@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {


    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareOrderTaskService wareOrderTaskService;

    @Autowired
    WareOrderTaskDetailService wareOrderTaskDetailService;

    @Autowired
    OrderFeignService orderFeignService;

    /**
     * 库存自动解锁
     *
     */

    private void unlockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        // 库存解锁
        wareSkuDao.unlockStock(skuId, wareId, num);
        // 更新库存工作单状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);
        wareOrderTaskDetailService.updateById(entity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmptyOrWhitespaceOnly(skuId)) {
            wrapper.eq("sku_id", skuId);
        }
        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmptyOrWhitespaceOnly(wareId)) {
            wrapper.eq("ware_id", wareId);
        }

        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );


        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录新增
        List<WareSkuEntity> wareSkuEntities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (wareSkuEntities == null || wareSkuEntities.size() == 0) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0) {
                    wareSkuEntity.setSkuName((String) data.get("skuName"));
                }else {

                }
            }catch (Exception e) {

            }
            wareSkuDao.insert(wareSkuEntity);
        }else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku的总库存量
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 为订单锁定库存方法
     * (rollbackFor = NoStockException.class)
     * 默认只要是运行时异常都会回滚
     * @param vo
     * @return
     */
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单详情
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        wareOrderTaskService.save(taskEntity);
        //1 按照下单的收货地址，找到一个就近仓库，锁定库存
        //1 找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());
        Boolean allLock = true;
        //2 锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                throw new NoStockException(skuId.toString());
            }
            //1 如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发给MQ
            //2 锁定失败。前面保存的工作单信息要回滚
            for (Long wareId : wareIds) {
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    skuStocked = true;
                    //TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity( null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    wareOrderTaskDetailService.save(entity);
                    //发送消息
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity, stockDetailTo);
                    lockedTo.setDetailTo(stockDetailTo);
                    System.out.println("将要发送消息了.......");
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", lockedTo);
                    break;
                }else {
                    //当前仓库锁失败
                    continue;
                }
            }
            if (skuStocked == false) {
                throw new NoStockException(skuId.toString());
            }
        }
        //3 肯定全部锁定成功
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        StockDetailTo detailTo = to.getDetailTo();
        Long skuId = detailTo.getSkuId();
        Long detailId = detailTo.getId();
        //解锁
        //1 查询数据库关于这个订单的锁定库存信息
        //有：证明库存锁定成功
        //  解锁：订单情况
        //          1 没有这个订单，必须解锁
        //          2 有这个订单。不是解锁库存了
        //              订单状态：已取消：解锁库存
        //                       没取消：不能解锁
        //没有：库存锁定失败了，库存自己回滚了。这种情况无需解锁
        WareOrderTaskDetailEntity byId = wareOrderTaskDetailService.getById(detailId);
        if (byId != null) {
            //解锁
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = wareOrderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn(); //根据订单号查询订单状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                //订单数据返回能够
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });

                if (data == null || data.getStatus() == 4) {
                    //订单不存在
                    //订单已经被取消了，解锁库存
                    if (byId.getLockStatus() == 1) {
                        //当前库存工作单详情，状态1 已锁定但未解锁，才可以解锁
                        unlockStock(detailTo.getSkuId(), detailTo.getWareId(), detailTo.getSkuNum(), detailId);
                    }
                }
            }else {
                throw new RuntimeException("远程服务失败");
            }
        }else {
            //无需解锁
        }
    }

    //防止订单服务卡顿，导致订单状态消息一直改不了，库存消息优先到期。查订单状态是新建状态，什么都不做就走了
    //导致卡顿的订单永远不能解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新的库存状态，防止重复解锁库存
        WareOrderTaskEntity task = wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        //按照工作单，找到所有没有解锁的库存进行解锁
        List<WareOrderTaskDetailEntity> entities = wareOrderTaskDetailService.list(
                new QueryWrapper<WareOrderTaskDetailEntity>()
                        .eq("task_id", id)
                        .eq("lock_status", 1)
        );
        for (WareOrderTaskDetailEntity entity : entities) {
            unlockStock(entity.getSkuId(), entity.getWareId(), entity.getSkuNum(), entity.getId());
        }

    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}